Fixed importer

util/importer.py

 import json
 import os
 import readline
-import util
 
 from util.messages import warn
 from core.models import ExamType, Feedback, Submission, SubmissionType, Test
@@ -35,15 +34,11 @@ valid = {"yes": True, "y": True, "ye": True, "no": False, "n": False}
 ORIGIN_ORDER = {
     Feedback.WAS_EMPTY,
     Feedback.DID_NOT_COMPILE,
-    Feedback.COULD_NOT_LINK,
-    Feedback.FAILED_UNIT_TESTS,
 }
 
 TEST_ORDER = (
-    util.processing.EmptyTest.__name__,
-    util.processing.CompileTest.__name__,
-    util.processing.LinkTest.__name__,
-    util.processing.UnitTestTest.__name__,
+    'EmptyTest',
+    'CompileTest',
 )
 
 FEEDBACK_MAPPER = dict(zip(TEST_ORDER, ORIGIN_ORDER))
@@ -129,7 +124,7 @@ def load_hektor_json():
 
     exam, _ = ExamType.objects.get_or_create(**exam_data['module'])
 
-    for submission_type in exam['submission_types']:
+    for submission_type in exam_data['submission_types']:
         SubmissionType.objects.get_or_create(**submission_type)
 
     for student in exam_data['students']:
@@ -183,12 +178,9 @@ def add_tests(submission_obj, tests):
 
 
 def add_feedback_if_test_recommends_it(test_obj):
-    available_tests = util.processing.Test.available_tests()
-
-    if test_obj.label == available_tests[test_obj.name].label_failure \
-        and not hasattr(test_obj.submission, 'feedback') \
-        and (test_obj.name == util.processing.EmptyTest.__name__ or
-             test_obj.name == util.processing.CompileTest.__name__):
+    # TODO rework this brittle code
+    if (test_obj.label == 'EMPTY' or test_obj.label == 'COMPILATION_FAILED') \
+            and not hasattr(test_obj.submission, 'feedback'):
         return Feedback.objects.update_or_create(
             of_submission=test_obj.submission,
             defaults={